Arrogant bosses cover insecurity

Arrogance is characterized by a pattern of behavior that demeans others in an attempt to prove competence and superiority. Silverman says this behavior is correlated with lower intelligence scores and lower self-esteem when compared to managers who are not arrogant. [emphasis mine]

Not only does this damage business productivity, the emphasis of the article, it damages the psyche of everyone who interacts with the SOB. One sees the same thing in the arrogant teacher, spouse, or next door neighbor.